title: Spectrophotometric study of complex formations between 1-(2-pyridylazo)-2-naphthol (PAN) and some metal ions in organic solvents and the determination of thermodynamic parameters.
abstract: The complexation reactions between Ni(2+), Co(2+) and Zn(2+) metal ions with PAN in methanol (MeOH), acetonitrile (AN) and dimethyl sulfoxide (DMSO) were studied using a spectrophotometric method. The stability constants of the resulting complexes were determined from computer fitting absorbance mole-ratio data. The results revealed that the stability constants of complexes are varying in order of Ni(2+)<Zn(2+)<Co(2+) for all solvents. The values of the thermodynamic parameters (ΔH°, ΔS° and ΔG°) for complexation reactions were obtained from the temperature dependence of the stability constants.
authors.affiliation: Department of Chemistry, Islamic Azad University Dezful Branch, Khuzestan, Iran. zhila.safari@gmail.com
authors.forename: Z
authors.initials: Z
authors.lastname: Safari
authors.forename: M B
authors.initials: MB
authors.lastname: Gholivand
authors.forename: L
authors.initials: L
authors.lastname: Hosseinzadeh
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D007477:Ions; D007700:Kinetics; D008024:Ligands; D008670:Metals / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D009284:Naphthols / Q000737:chemistry*; D012996:Solutions; D012997:Solvents / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods*; D013816:Thermodynamics
chemical_list: D000097:Acetonitriles; D007477:Ions; D008024:Ligands; D008670:Metals; D009284:Naphthols; D012996:Solutions; D012997:Solvents; C041728:1-(2-pyridylazo)-2-naphthol; D000432:Methanol; D004121:Dimethyl Sulfoxide; C032159:acetonitrile